Revert of Change default minimum screencast frame rate to zero.

content/renderer/media/media_stream_constraints_util_video_content.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/media_stream_constraints_util_video_content.h"
 
 #include <algorithm>
 #include <cmath>
 #include <utility>
 #include <vector>
@@ skipping 17 matching lines @@
 
 const int kDefaultScreenCastWidth = 2880;
 const int kDefaultScreenCastHeight = 1800;
 const double kDefaultScreenCastAspectRatio =
     static_cast<double>(kDefaultScreenCastWidth) / kDefaultScreenCastHeight;
 static_assert(kDefaultScreenCastWidth <= kMaxScreenCastDimension,
               "Invalid kDefaultScreenCastWidth");
 static_assert(kDefaultScreenCastHeight <= kMaxScreenCastDimension,
               "Invalid kDefaultScreenCastHeight");
 
+const double kMinScreenCastFrameRate = 1.0 / 60.0;
 const double kMaxScreenCastFrameRate = 120.0;
 const double kDefaultScreenCastFrameRate =
     MediaStreamVideoSource::kDefaultFrameRate;
 
 namespace {
 
 using Point = ResolutionSet::Point;
 using StringSet = DiscreteSet<std::string>;
 using BoolSet = DiscreteSet<bool>;
 
@@ skipping 328 matching lines @@
 }
 
 }  // namespace
 
 VideoCaptureSettings SelectSettingsVideoContentCapture(
     const blink::WebMediaConstraints& constraints,
     const std::string& stream_source) {
   VideoContentCaptureCandidates candidates;
   candidates.set_resolution_set(ScreenCastResolutionCapabilities());
   candidates.set_frame_rate_set(
-      DoubleRangeSet(0.0, kMaxScreenCastFrameRate));
+      DoubleRangeSet(kMinScreenCastFrameRate, kMaxScreenCastFrameRate));
   // candidates.device_id_set and candidates.noise_reduction_set are
   // automatically initialized with the universal set.
 
   candidates = candidates.Intersection(
       VideoContentCaptureCandidates(constraints.Basic()));
   if (candidates.IsEmpty())
     return UnsatisfiedConstraintsResult(candidates, constraints.Basic());
 
   for (const auto& advanced_set : constraints.Advanced()) {
     VideoContentCaptureCandidates advanced_candidates(advanced_set);
     VideoContentCaptureCandidates intersection =
         candidates.Intersection(advanced_candidates);
     if (!intersection.IsEmpty())
       candidates = std::move(intersection);
   }
 
   DCHECK(!candidates.IsEmpty());
   return SelectResultFromCandidates(candidates, constraints.Basic(),
                                     stream_source);
 }
 
 }  // namespace content